28404280 has 32 divisors (see below), whose sum is σ = 67670640. Its totient is φ = 10693120.

The previous prime is 28404269. The next prime is 28404281. The reversal of 28404280 is 8240482.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28404281) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20206 + ... + 21565.

Almost surely, 2^28404280 is an apocalyptic number.

28404280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28404280 is an abundant number, since it is smaller than the sum of its proper divisors (39266360).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28404280 is a wasteful number, since it uses less digits than its factorization.

28404280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41799 (or 41795 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 28.

The square root of 28404280 is about 5329.5665865059. The cubic root of 28404280 is about 305.1133861325.

The spelling of 28404280 in words is "twenty-eight million, four hundred four thousand, two hundred eighty".